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4

In hot machining, tool is made of

A. Tungsten carbide

B. Brass or copper

C. Diamond

D. Stainless steel

Correct Answer :

A. Tungsten carbide


Related Questions

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4

In abrasive jet machining, as the distance between the nozzle tip and the work surface increases, the material removal rate

A. Increases continuously

B. Decreases continuously

C. Decreases, becomes stable and then increases.

D. Increases, becomes stable and then decreases.

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4

Tool signature consists of __________ elements.

A. Two

B. Four

C. Five

D. Seven

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4

The grade of grinding wheel depends upon

A. Hardness of the material being ground

B. Speed of wheel and work

C. Condition of grinding machine

D. All of these

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4

A 15 mm drilling machine means that it can drill a hole

A. Of maximum diameter 15 mm

B. In 15 mm thick plates

C. Having cross-sectional area of 15 mm²

D. None of these

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4

In down milling, the thickness of chip is

A. Minimum at the beginning of the cut and maximum at the end of the cut

B. Maximum at the beginning of the cut and minimum at the end of the cut

C. Uniform throughout the cut

D. None of these

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4

Friction at the tool-chip interface can be reduced by

A. Decreasing the rake angle

B. Increasing the depth of cut

C. Decreasing the cutting speed

D. Increasing the cutting speed

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4

Stellite preserves hardness upto a temperature of

A. 350°C

B. 500°C

C. 900°C

D. 1100°C

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4

In metal cutting, use of low feeds and high cutting speeds is desired when the objective is

A. High metal removal rate

B. Dry machining

C. Use of soft cutting tool

D. Surface finish

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4

In metal machining, the zone where the heat is generated due to friction between the moving chip and the tool face, is called

A. Friction zone

B. Work-tool contact zone

C. Shear zone

D. None of these

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4

The floating position of the holding fixture in a rotary transfer device is used to

A. Improve the accuracy of location

B. Reduce the tendency to over-index

C. Improve upon the acceleration and deceleration characteristics

D. Reduce the cycle time

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4

In plunge grinding

A. The work is reciprocated as the wheel feeds to produce cylinders longer than the width of wheel face

B. The work rotates in a fixed position as the wheel feeds to produce cylinders equal to or shorter than the width of wheel face

C. The work is reciprocated as the wheel feeds to produce cylinders shorter than the width of wheel face

D. The work rotates in a fixed position as the wheel feeds to produce cylinders longer than the width of wheel face

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4

The correct sequence of the following parameters in order of their maximum to minimum influence on tool life is

A. Feed rate, depth of cut, cutting speed

B. Depth of cut, cutting speed, feed rate

C. Cutting speed, feed rate, depth of cut

D. Feed rate, cutting speed, depth of cut

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4

What is the type of welding defect caused due to poor manipulation of weld rod or a dirty joint called?

A. Porosity

B. Undercut

C. Under fill

D. Crack

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4

The common welding error that occurs due to shrinkage of weld metal, faulty clamping of parts, faulty penetration or overheating at joints is called?

A. Distortion

B. Warping

C. Porous weld

D. Poor fusion

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4

What is the welding defect caused due to improper control and poor removal of slog between passes called?

A. Mismatch

B. Under fill

C. Crack

D. Porosity

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4

The cutting speed for drilling aluminium, brass and bronze with carbon steel drills is _________ cutting speed for drilling mild steel with high speed steel drills.

A. Equal to

B. Less than

C. More than

D. None of these

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4

The taper on the lathe spindle is

A. 1 in 10

B. 1 in 15

C. 1 in 20

D. 1 in 30

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4

In a CNC program block, N002 GO2 G91 X40 Z40......, GO2 and G91 refer to

A. Circular interpolation in counter clockwise direction and incremental dimension

B. Circular interpolation in counter clockwise direction and absolute dimension

C. Circular interpolation in clockwise direction and incremental dimension

D. Circular interpolation in clockwise direction and absolute dimension

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4

A fixture is defined as a device which

A. Holds and locates a workpiece and guides and controls one or more cutting tools

B. Holds and locates a workpiece during an inspection or for a manufacturing operation

C. Is used to check the accuracy of workpiece

D. All of the above

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4

A lathe with four steps on the cone pulley and with back-gears will have

A. Four direct speeds

B. Four indirect speeds

C. Four direct and four indirect speeds

D. Eight indirect speeds

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4

Flank wear occurs mainly on the

A. Nose part, front relief face and side relief face of the cutting tool

B. Face of the cutting tool at a short distance from the cutting edge

C. Cutting edge only

D. Front face only

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4

The common welding error that occurs due to wrong speed, faulty preparation, and high / low current, improper electrode size is called?

A. Distortion

B. Warping

C. Porous weld

D. Poor fusion

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4

High speed steel cutting tools operate at cutting speeds _________ than carbon steel tools.

A. 2 to 3 times lower

B. 2 to 3 times higher

C. 5 to 8 times higher

D. 8 to 20 times higher

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4

The factor considered for evaluation of machinability is

A. Cutting forces and power consumption

B. Tool life

C. Type of chips and shear angle

D. All of these

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4

In metal cutting operations, the shear angle is the angle made by the shear plane with the

A. Direction of the tool axis

B. Direction of tool travel

C. Perpendicular to the direction of the tool axis

D. Central plane of the workpiece

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4

Two streams of liquid metal which are not hot enough to fuse properly result into a casting defect known as

A. Cold shut

B. Swell

C. Sand wash

D. Scab

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4

In DC arc welding, if leads are arranged in work as Negative pole of the welding arc and electrode as Positive pole of the welding arc, the arrangement is known as

A. Fusion

B. Reverse polarity

C. Forward welding

D. Direct polarity

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4

A diamond locating pin is used in jigs and fixtures because

A. Diamond is very hard and wear resistant

B. It occupies very little space

C. It helps in assembly with tolerance on centre distance

D. It has a long life

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4

The size of abrasive grain required in a grinding wheel depends upon the

A. Amount of material to be removed

B. Hardness of material being ground

C. Finish desired

D. All of these

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4

The rear teeth of a broach

A. Perform burnishing operation

B. Remove minimum metal

C. Remove maximum metal

D. Remove no metal